Issues with new Surface Pro 5 screens

[diamon]

I have three Microsoft Surface Pro 5 model 1796, with all cracked screens.
Have bought from Aliexpress three new screens, the part numbers from my and the seller are the same:

Bad working China screen part number:


Good working own screen part number


Error I get with the bad working China screen:


No error with the good working own screen:



All the three China screens (all the same exact part numbers) produce the same error in Device manager. Have also performed a clean installation of Windows 10 Pro with the China screen, but also then the same error.
Have installed all the Windows updates and optional updates and even installed a driver pack from Microsoft for this Surface, but no differences.

I have bought the 3 screens with the Touch Screen Digitizer Connector Sub Board, but also with the board from my own good working screen, the China screens produce the same error.


Someone who recognizes this issue are has an idea for a fix?.

[diamon]

Re: Issues with new Surface Pro 5 screens

Nobody who has an idea what the cause could be ?

[mon2]

Re: Issues with new Surface Pro 5 screens

To me, the fault is on the tcon boards with the non-working lcds.

To confirm with 100% confidence, use a low cost I2C bus (aka smbus) bus analyzer on the I2C lines (SCL and SDA). You will know then from the bus logs, exactly why and what is failing in the handshake between the host and the tcon boards.

[mon2]

Re: Issues with new Surface Pro 5 screens

I think that you can use Arduino for this purpose to log the the traffic but we use Total Phase and other lab tools. Should be under $100 for sure these days.

Here is a random i2C sniffer DYI project - using the RPI2040 (aka PI ZERO) which is ~$4 USD.

https://github.com/jjsch-dev/pico_i2c_sniffer

There are bound to be others. The good part of the RP2040 architecture is that the design features hardware activated state machines which behave like FPGA devices so can accelerate things like serial ports / sampling, etc.

Also, try some of the ideas posted here:

https://answers.microsoft.com/en-us/...8-4b6988f82b27

[mon2]

Re: Issues with new Surface Pro 5 screens

Wow - same issue posted here...

https://answers.microsoft.com/en-us/...574f6c0?page=1

Given that the orginal LCD works - could the hardware contain some authentication device to permit or reject the use of the screen? Much like Apple / Foxconn are doing on the more recent iphones.

[reformatt]

Re: Issues with new Surface Pro 5 screens

I honestly give Surface Pro's a wide berth, primarily because of the parts situation. I had enough of this BS with phones.

[diamon]

Re: Issues with new Surface Pro 5 screens

First of all, sorry for no reaction from my part (some medical issues).

Does someone has a schematic of this connector regarding the i2C and the power lines ?